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(No Model.)

2 .Sheets-Sheet; l.

El M. HAMILTON. TYPE WRITING MAGHINE.

l Patented June 24, 1890.

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E. M. HAMILTON. TYPE WRITING MACHINE.

(No Model.)

No. 430,772. Patented June 24,1890.

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UNITED STATES PATENT OFFICE.

EMERY M. HAlWllLTON, OF NEV YORK, N. Y.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 430,772, dated J une 24, 1890.

Application filed February 10, 1890. Serial No. 339,767. (No model.)

To all whom t may con/cern.-

Be it known that I, EMERY M. HAMILTON, ofthe city, county, and State of New York, a citizen of United States, have invented certain new and useful Improvements in Type- Vriting Machines, of' which the following is a full, clear, and exact description,'reference being had to the accompanying drawings, forming part of this specification.

My invention relates to the paper-carriage and platen of a typewriting machine; and my invention consists in the hereinafter-described devices whereby the paper to be printed upon is held in position on the platen, whereby the carriage is mounted and adapted to effect its longitudinal movement across the machine in the operation of printing, and whereby the plat-en is rotated to produce the line-spacing.

Figure l is a plan of a paper-carriage containing my invention and showing its con nected and actuating devices in a type-writing machine. Fig. 2 is. a front elevation of the carriage. Fig. 3 is an end elevation of the carriage, showing the ways upon which it moves in cross-section. Fig. l is a vertical cross-section of the carriage on line :n Fig. l. Fig. 5 is a side elevation in normal position of the devices for rotating the platen. Fig. 6 is a similar viewof the same in posi- -tion at the conclusion of apartial rotation of the platen. Figs. 7 and S are respectively an end elevation and a plan of the ways on which the carriage travels.

The paper-carriage in its general structure is similar to the usual carriages in type-writing machines-that is to say, the carriageframe is composed of a `rod a, extending longitudinally of the rearward side of the carriage and fixed on a bar a', which is adapted to slide in ways across the machine. A corresponding' rod a2 constitutes the front of the frame, and has a friction-roller awhich travels on a rail c4. End yokes c5 and c are pivotally mounted at one end on the rod a, and are united at their opposite ends by the rod ce2. The cylindrical platen B is journaled in said yokes, as shown. The rail a* bears the usual letter-scale shown, with which is combined the customary pointer a7 on the front of the carriage. A paper-guide as may be provided on the carriage-frame in front of the platen. The carriage is thus adapted to swing on the rod a, so as to expose the printing-line on the platen to the operator in the usual manner. The carriage may be given its longitudinal movement across the machine by the usual pulling-cord a9, attached at one end to the bar a of the carriage and at the opposite end to the well-known spring-drum am. The motion of the carriage may be controlledin its said longitudinal movement to effect the spacing on the printing-line between. letters and words by the customary rack a, fixed and extending longitudinally on' the carriage-frame, into whichtthe dogs C and C take, and which dogs are controlled usually by springs, and are actuated by the universal lever C2 of the machine through the arm c thereof and a reciprocatory bar It will be understood that the vibration of the universal lever C2, by engagement with its arm c of either a finger-key lever, as shown at C, or the spacing-key lever, as shown at C5, will swing the arm c of said universal lever so as to reciprocate the bar (l3 and cause the 'dog C as it engages a tooth on the rack a, and thus holds the carriage at rest, to at the same time rock the dog C on its pivot by engagement with the heel c2 thereon, so as to disengage the dog C from the rack. Upon the release of the universal lever` by the keylever the arm c of' said universal lever will be reversely vibrated, and as the retractingspring c3 of the dog C withdraws said dog from its engagement with the rack the dog C will be consequently released,and will be actuated by its spring c4 to move on its slotted pivotbearing, so as to engage a succeeding tooth on the rack all. The dog C may be provided with an arm c5, and a sliding bar c6 may be arranged, as shown, to engage said arm c5, whereby the dog C may be oscillated to disengage it from the rack a, whereupon the carriage may be moved freely back and forth on its ways.

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nected devices to take up any wear thereof or lost motion, and so as to give the requisite movement to the dogs O and C from the oscillations of the universal lever.

The way D may be composed of two paral-- lel plates CZ d', adapted to be mounted on the machine-frame adjustable relatively to each otheras, for example, by means of slotted apertures b2 in one or both of said plates and screws p3 passing through said apertures and into the machine-frame. In the upper faces of these parallel plates I form a longitudinal dovetail groove b4, making a portion of the groove in each plate, as shown, and adapted to receive a corresponding longitudinal dovetail rib am, formed Von the bar a', as shown. The positions of the groove and rib may of course be reversed, in which case a portion of the dovetail rib would be formed on each of the plates d CZ.

A further feature of my invention consists in the combination, with the cylindrical platen B, of a pressure-plate E,in the following manner: This plate E extends longitudinally of the platen continuously from end to end, and isformed with a plane portion e, which is tangential to the circumference of the platen, thus constituting' a throat-like space between the plate and the platen, into which the paper to be placed on the platen may be introduced. The portion of the plate E which extends over the platen toward the printing-line thereon is curved flatwise, as at c', to conform to the platens periphery, as shown. The plate E is pivotally hung upon the rod 0Lv of the carriage-frame, so as to swing thereon and traverse the same with the platen, and this is accomplished by means of lugs c2, formed on the plate E at the ends thereof by bending the plate angularly, as shown, which lugs are perforated to fit to the rod a. Upon each end of the plate E are iixed spring-arms e3, preferably in the form of leaf-springs, as shown, which are adapted to reach under the platen to and be seated upon the front rod a2 of the carriage-frame. The'action of these spring-arms e3 is therefore to hold the curved face e of the plate E to the platen-surface with a yielding pressure, so that while the paper sheet to be printed upon will be held firmly to the platen without the aid of a pressure-roller the platen may be freely rotated to introduce the paper to position thereon and to feed the paper The spring-arms line by line in printing. e3 being located at the extreme ends of the plate E, and the plate being made of a requisite length, said arms may be caused to lie wholly beyond the ends 0f the practical printing-line on the platen, so that the plate E will support the paper on the platen without obstructing or obscuring the surface of the paper thereon.

F is a pointer, which is used in'connection with the platen to indicate the location thereon of the common printing-point of the series of printing-types, in place of a second or its said spring.

supplemental letter-space scale mounted on the platen.

It will be understood that in Fig. 1 of the drawings the circle T illustrates the location in the machine of a series of radially-arranged vibratory type bars, (not showin) which are adapted to strike or print on the platen at a point common to the series. This feature of type-writing machines is wellknown.

The pointer F, the index end of which points to the common printing-point of the type-bar series on the platen, is employed in connection with the platen by being hinged or pivotally mounted on the carriage-frameas, forexample, upon the rod d of said frameby means of a sleeve f, carrying the pointer, through which sleeve the rod passes loosely. The pointer is curved to conform to the cylindrical surface of the platen and reaches `around under the platen to and terminates j ust below the printing-line thereon, as shown. It is free to swing or vibrate with the platen on the rod a when the platen is lifted to expose the printing-line to the operator, while a novel feature of this pointer is that it is at the same time prevented from longitudinal movement on the rod d with the carriage by means of a lug or pin f on the bar a', which engages a peripheral slot f2 in the sleeve f. The pointer F is preferably th us mounted and arranged on the rod a immediately beneath the pressure-plate E, and extends to the forward edge of said plate on the under face thereof, as shown.

The devices employed to rotate the platen to effect the line-spacing are as follows: G is a lever pivotally mounted on the rod a of the carriage-frame at onel end of the platen, and extending forwardly on the carriage across the journal of the platen. This lever is provided with a spring g, fixed on the end yoke a of the carriage-frame, and adapted to press the lever upward to its limit of movement on its said pivot. The lever has on its under side the depending lug g', which is provided with the segmental guide-slot g2, adapted to engage the axis or journal of the platen, as shown. Upon the lever G is pivoted a pawl g3, which is adapted in location and direction to engage a ratchet g4, iixed on the platen end, and to rotate the platen through the distance of one of the teeth of said ratchet when said lever is vibrated downward against the stress of itsv spring to the limit of its movement in such direction, and to ride the succeeding tooth of the ratchet and assume a position in line above it when the lever G is retracted upward to its limit of movement by The pawl gis formed or provided with a weighted heel g5 beyond its pivot on the lever, so that when the lever is thrown upward the said heel will, by gravity, swing the pawl to its stated position relatively to the ratchet. A downward pressure, therefore, on the free end of the lever G, which end is, as stated, on the forward side of the,V

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carriage, where it may be convenient-ly manipulated, will operate to rotate the platen the distance of a predetermined space between the lines of printing.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. In a type-writing machine, the combination of a rack a on the paper-carriage, spring-controlled dogs C C to engage and operate said rack, and the universal lever G2 to aotuate said dogs with a reciprocatory bar C3, composed of two parts united endwise by screw-joint c7, one of which parts is journaled at cS in the arm c of said universal lever, and the other of which parts engages said dogs, substantially as and for the purpose set forth.

2. In a paper-carriage for type-writing machines, the combination of the rotary cylindrical platen B,with a pressure-plateE extending longitudinally and continuously on the platen and having the plane portion e. and curved portion e', said plate being provided with the angular perforated end lugs e2, bent from said plate and pivotally engaging the hinge-bar a of the platen, and with the springarms c3, projecting from the front edge of said plate at the ends thereof and reaching forwardly of the carriage-frame to and seated upon the front rod CL2 thereof, substantially as and for the purpose set forth.

3. In a paper-carriage for type writing machines, the combination, with the cylindrical platen B, journaled in the carriage-frame hinged to the rod a, of a correspondinglycurved pointer F, reaching to the printing-line on the platen and carried by a sleeve f, mounted loosely on the hinge-rod a, and provided with a peripheral slot f 2, together with axed pin f', adapted to engage said peripheral slot and prevent the movement of said sleeve longitudinally of said hinge-rod, substantially as and for the purpose set forth.

4. In a paper-carriage for type-writing niachines, the combination, with the cylindrical platen B, journaled in the hinged yokes a5 d6, and a correspondingly-curved pressure-plate E, hinged at its ends by lugs e2 to the hingerod of the platen, and extending longitudinally and continuously on the platen, and provided at its ends with the spring-arms e3, adapted to reach forwardly of the carriageframe to and be seated on the front rod thereof, of a curved pointer F, carried by a peripherally-slotted sleeve f, mounted loosely on the hinge-rod of the platen and on the rear or under side of said pressure-plate, and a fixed pin f to engage said slot, said pointer being adapted to reach below and around said pressure-plate to the front edge thereof on the platen, substantially as and for the purpose set forth.

5. In a paper-carriage for type-writing machines, the combination, with the journaled platen provided at one end with the ratchet g4, of the spring-controlled lever G, fulcrumed on the rod d of the carriage-frame and extending to the front of the carriage, and provided with lug g', having the guide-slot g2 to engage the axle of the platen,together with the pawl g3, pivoted on said lever and adapted to engage the ratchet on the platen when the lever is vibrated downward, and the weighted heel g5 on said pawl, whereby the pawl is swung to position above the ratchet when the lever is vibrated upward, substantially as and for the purpose set forth.

EMERY M. HAMILTON.

Iitnessesz EDWARD STEPHENS, FRANK B. PnEIDoN. 

